From 63fb8f9aa9d19f85599afe4b849b567aefd70a36 Mon Sep 17 00:00:00 2001 From: Zack Weinberg Date: Mon, 5 Feb 2018 14:13:41 -0500 Subject: Post-cleanup 2: minimize _G_config.h. Nearly everything in _G_config.h is either junk or more appropriately defined elsewhere: * _G_fpos_t, _G_fpos64_t, and _G_BUFSIZ are already completely unused. * All remaining uses of _G_va_list have been changed to __gnuc_va_list. * The definition of _G_HAVE_ST_BLKSIZE/_IO_HAVE_ST_BLKSIZE has been inlined into its sole use. * The complete definition of _G_iconv_t has been moved to libio.h and renamed _IO_iconv_t (all actual users used that name). * _G_IO_IO_FILE_VERSION is vestigial; some code cares whether _IO_stdin_used exists, but nothing looks at its value. I've preserved the value as a hardwired constant in csu/init.c. This means csu/init.c no longer needs to include anything. * Many of the headers included by _G_config.h were already being included directly by either either libio.h or stdio.h; the remaining ones were moved to libio.h. * _G_HAVE_MREMAP is still relevant, because mremap genuinely is a Linux extension; it's not in POSIX and as far as I can tell it's not available on the Hurd either. I also preserved _G_HAVE_MMAP, since it's conceivable someone would want to port glibc to a MMU-less, mmap-less environment in the future. Both are now always defined to 1/0 as is the current convention, instead of the older 1/undef convention. These are the only symbols still defined in _G_config.h. * The actual inclusion of _G_config.h moves from libio.h to libioP.h, as this is where a potential override of _G_HAVE_MMAP happens. * The #ifdef logic in libioP.h controlling _IO_JUMPS_OFFSET has been simplified. After this patch, the only surviving _G_ symbols are the struct tag names _G_fpos_t and _G_fpos64_t, which are preserved for the sake of C++ mangled names in applications, and _G_HAVE_MMAP and _G_HAVE_MREMAP, which do not seem worth renaming. Installed stripped libraries are unchanged by this patch. * bits/_G_config.h: Move back to sysdeps/generic/_G_config.h. Delete all contents except for definitions of _G_HAVE_MMAP and _G_HAVE_MREMAP. Add commentary explaining those two symbols. * sysdeps/unix/sysv/linux/bits/_G_config.h: Move back to sysdeps/unix/sysv/linux/_G_config.h. Make same content change as above. * libio/libio.h: Don't include bits/_G_config.h here. Include stddef.h with __need_wchar_t defined. Include bits/types/__mbstate_t.h, bits/types/wint_t.h, and gconv.h. Define _IO_iconv_t here, directly. Don't define _IO_HAVE_ST_BLKSIZE. * libio/libioP.h: Include _G_config.h here. Move include of shlib-compat.h up with rest of includes. Simplify conditionals controlling definition of _IO_JUMPS_OFFSET. * csu/init.c: Remove always-true #if around entire file. Don't include stdio.h. Set _IO_stdin_used to hardwired constant 0x20001, and update commentary. * include/stdio.h, sysdeps/ieee754/ldbl-opt/nldbl-compat.h: Replace all uses of _G_va_list with __gnuc_va_list. * libio/filedoalloc.c: Use #if defined _STATBUF_ST_BLKSIZE instead of #if _IO_HAVE_ST_BLKSIZE. * libio/fileops.c: Test _G_HAVE_MREMAP with #if, not #ifdef. * libio/iofdopen.c, libio/iofopen.c: Test _G_HAVE_MMAP with #if, not #ifdef. --- libio/filedoalloc.c | 2 +- libio/fileops.c | 2 +- libio/iofdopen.c | 4 ++-- libio/iofopen.c | 2 +- libio/libio.h | 22 ++++++++++++++++++---- libio/libioP.h | 20 ++++++++++---------- 6 files changed, 33 insertions(+), 19 deletions(-) (limited to 'libio') diff --git a/libio/filedoalloc.c b/libio/filedoalloc.c index 329843827f..d6517e493b 100644 --- a/libio/filedoalloc.c +++ b/libio/filedoalloc.c @@ -93,7 +93,7 @@ _IO_file_doallocate (_IO_FILE *fp) local_isatty (fp->_fileno)) fp->_flags |= _IO_LINE_BUF; } -#if _IO_HAVE_ST_BLKSIZE +#if defined _STATBUF_ST_BLKSIZE if (st.st_blksize > 0 && st.st_blksize < _IO_BUFSIZ) size = st.st_blksize; #endif diff --git a/libio/fileops.c b/libio/fileops.c index 6d5393cea3..5fd8a9647f 100644 --- a/libio/fileops.c +++ b/libio/fileops.c @@ -582,7 +582,7 @@ mmap_remap_check (_IO_FILE *fp) { /* The file added some pages. We need to remap it. */ void *p; -#ifdef _G_HAVE_MREMAP +#if _G_HAVE_MREMAP p = __mremap (fp->_IO_buf_base, ROUNDED (fp->_IO_buf_end - fp->_IO_buf_base), ROUNDED (st.st_size), MREMAP_MAYMOVE); diff --git a/libio/iofdopen.c b/libio/iofdopen.c index 3546d52b4d..b6f1500dee 100644 --- a/libio/iofdopen.c +++ b/libio/iofdopen.c @@ -126,13 +126,13 @@ _IO_new_fdopen (int fd, const char *mode) new_f->fp.file._lock = &new_f->lock; #endif _IO_no_init (&new_f->fp.file, 0, 0, &new_f->wd, -#ifdef _G_HAVE_MMAP +#if _G_HAVE_MMAP (use_mmap && (read_write & _IO_NO_WRITES)) ? &_IO_wfile_jumps_maybe_mmap : #endif &_IO_wfile_jumps); _IO_JUMPS (&new_f->fp) = -#ifdef _G_HAVE_MMAP +#if _G_HAVE_MMAP (use_mmap && (read_write & _IO_NO_WRITES)) ? &_IO_file_jumps_maybe_mmap : #endif &_IO_file_jumps; diff --git a/libio/iofopen.c b/libio/iofopen.c index d6f59497b4..2ea82e2091 100644 --- a/libio/iofopen.c +++ b/libio/iofopen.c @@ -33,7 +33,7 @@ _IO_FILE * __fopen_maybe_mmap (_IO_FILE *fp) { -#ifdef _G_HAVE_MMAP +#if _G_HAVE_MMAP if ((fp->_flags2 & _IO_FLAGS2_MMAP) && (fp->_flags & _IO_NO_WRITES)) { /* Since this is read-only, we might be able to mmap the contents diff --git a/libio/libio.h b/libio/libio.h index ff67e18c18..0953120247 100644 --- a/libio/libio.h +++ b/libio/libio.h @@ -41,8 +41,24 @@ # error "Someone forgot to include stdio-lock.h" #endif -#include -/* ALL of these should be defined in _G_config.h */ +#define __need_wchar_t +#include + +#include +#include +#include + +typedef union +{ + struct __gconv_info __cd; + struct + { + struct __gconv_info __cd; + struct __gconv_step_data __data; + } __combined; +} _IO_iconv_t; + +/* Map the names used in libio to the names used in libc generally. */ #define _IO_fpos_t __fpos_t #define _IO_fpos64_t __fpos64_t #define _IO_size_t size_t @@ -51,8 +67,6 @@ #define _IO_off64_t __off64_t #define _IO_pid_t __pid_t #define _IO_uid_t __uid_t -#define _IO_iconv_t _G_iconv_t -#define _IO_HAVE_ST_BLKSIZE _G_HAVE_ST_BLKSIZE #define _IO_BUFSIZ BUFSIZ #define _IO_wint_t wint_t #define _IO_va_list __gnuc_va_list diff --git a/libio/libioP.h b/libio/libioP.h index 8edc207277..58cc9de094 100644 --- a/libio/libioP.h +++ b/libio/libioP.h @@ -46,6 +46,12 @@ #include #include "iolibio.h" +#include + +/* For historical reasons this is the name of the sysdeps header that + adjusts the libio configuration. */ +#include <_G_config.h> + #ifdef __cplusplus extern "C" { #endif @@ -75,16 +81,10 @@ extern "C" { * object being acted on (i.e. the 'this' parameter). */ -#include -#if !SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) - /* Setting this macro disables the use of the _vtable_offset bias in - _IO_JUMPS_FUNCS, below. That is only needed if we want to - support old binaries (see oldfileops.c). */ -# define _G_IO_NO_BACKWARD_COMPAT 1 -#endif - -#if (!defined _IO_USE_OLD_IO_FILE \ - && (!defined _G_IO_NO_BACKWARD_COMPAT || _G_IO_NO_BACKWARD_COMPAT == 0)) +/* Setting this macro to 1 enables the use of the _vtable_offset bias + in _IO_JUMPS_FUNCS, below. This is only needed for new-format + _IO_FILE in libc that must support old binaries (see oldfileops.c). */ +#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) && !defined _IO_USE_OLD_IO_FILE # define _IO_JUMPS_OFFSET 1 #else # define _IO_JUMPS_OFFSET 0 -- cgit 1.4.1